/Engine/Source/Editor/UMGEditor/Public/WidgetBlueprintCompiler.h
Saves any SubObjects on the blueprint that need to survive the clean
virtual void SaveSubObjectsFromCleanAndSanitizeClass ( [FSubobjectCollection](API\Editor\KismetCompiler\FKismetCompilerContext\FSubobjectCollection) & SubObjectsToSave, [UBlueprintGeneratedClass](API\Runtime\Engine\Engine\UBlueprintGeneratedClass) * ClassToClean )